ozeegers

Q: bootcamp partition renamed untitled after booting in MacOS

Can anybody please help me ?

 

I had succesfully installed Windows 10 on my Macbook Pro and ran Windows already several weeks smoothly.

Unfortunately I did not make a backup of my windows files yet.

 

Today when I booted to El Capitan to connect my iPad to iTunes Windows gave me a message that it needed repair when I tried to reboot to the bootcamp Windows version.

It did not succeed in repairing and only gave my an advanced options menu.

I booted back into MacOS to find that the windows partition was renamed to 'Untitled' and that no files were visible in Finder.

 

I than ran Disk Utility and selected First Aid on this partition, I thought this was read only to check for disk errors.

Now when booting from Windows it says no operation system available and Disk Utility shows 496 GB empty space on this partition !

 

I hope not all my files are lost !!

What can I do to repair the bootcamp partition ? I tried to install setup bootcamp files on USB but cannot boot from USB (does not show the USB drive)

 

thank you !

 

Olivier

MacBook Pro, OS X El Capitan (10.11.3), Bootcamp Windows 10

Posted on Apr 5, 2016 11:34 AM

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Q: bootcamp partition renamed untitled after booting in MacOS

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  • by Loner T,

    Loner T Loner T May 1, 2016 5:01 AM in response to ozeegers
    Level 7 (24,202 points)
    Safari
    May 1, 2016 5:01 AM in response to ozeegers

    If you use count=1440 it will dump all the blocks in the gap. It should be about 700MB. If you want to use DropBox to upload it, I can take a look.

     

    I do not use TeamViewer.

  • by ozeegers,

    ozeegers ozeegers May 1, 2016 9:20 AM in response to Loner T
    Level 1 (5 points)
    Windows Software
    May 1, 2016 9:20 AM in response to Loner T

    OK, I uploaded to wetransfer:

     

    sudo dd if=/dev/rdisk0s4 bs=512 count=1440 of=mbr2.bin

     

    https://we.tl/EIypHwLDO6

  • by ozeegers,

    ozeegers ozeegers May 2, 2016 12:47 AM in response to ozeegers
    Level 1 (5 points)
    Windows Software
    May 2, 2016 12:47 AM in response to ozeegers

    its around 700 kB, did you make a mistake when saying 700 Mb ? or did I do something wrong again ?

  • by Loner T,

    Loner T Loner T May 2, 2016 5:32 AM in response to ozeegers
    Level 7 (24,202 points)
    Safari
    May 2, 2016 5:32 AM in response to ozeegers

    You are correct, it is 700Kb.

  • by ozeegers,

    ozeegers ozeegers May 2, 2016 8:11 AM in response to Loner T
    Level 1 (5 points)
    Windows Software
    May 2, 2016 8:11 AM in response to Loner T

    OK, I uploaded to wetransfer:

     

    sudo dd if=/dev/rdisk0s4 bs=512 count=1440 of=mbr2.bin

     

    https://we.tl/EIypHwLDO6

  • by ozeegers,

    ozeegers ozeegers May 3, 2016 11:14 PM in response to ozeegers
    Level 1 (5 points)
    Windows Software
    May 3, 2016 11:14 PM in response to ozeegers

    still traveling ?

  • by Loner T,

    Loner T Loner T May 4, 2016 6:03 AM in response to ozeegers
    Level 7 (24,202 points)
    Safari
    May 4, 2016 6:03 AM in response to ozeegers

    I should get a chance later today to look. Thanks for being patient.

  • by ozeegers,

    ozeegers ozeegers May 6, 2016 1:50 PM in response to Loner T
    Level 1 (5 points)
    Windows Software
    May 6, 2016 1:50 PM in response to Loner T

    If the we transfer does not work anymore let me know.. I will upload again

  • by Loner T,

    Loner T Loner T May 6, 2016 3:29 PM in response to ozeegers
    Level 7 (24,202 points)
    Safari
    May 6, 2016 3:29 PM in response to ozeegers

    Can you post the output of

     

    sudo gpt -vv -r show /dev/disk0

  • by ozeegers,

    ozeegers ozeegers May 6, 2016 10:45 PM in response to Loner T
    Level 1 (5 points)
    Windows Software
    May 6, 2016 10:45 PM in response to Loner T

    did you download the mbr2.bin file via wetransfer ? nothing there ?

     

    output of sudo gpt -vv -r show /dev/disk0:

     

     

    gpt show: /dev/disk0: mediasize=750156374016; sectorsize=512; blocks=1465149168

    gpt show: /dev/disk0: Suspicious MBR at sector 0

    gpt show: /dev/disk0: Pri GPT at sector 1

    gpt show: /dev/disk0: Sec GPT at sector 1465149167

           start        size  index  contents

               0           1         MBR

               1           1         Pri GPT header

               2          32         Pri GPT table

              34           6       

              40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

          409640   538198808      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

       538608448     1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

       539877984        1440       

       539879424   925265920      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

      1465145344        3791       

      1465149135          32         Sec GPT table

      1465149167           1         Sec GPT header

  • by Loner T,

    Loner T Loner T May 7, 2016 6:48 AM in response to ozeegers
    Level 7 (24,202 points)
    Safari
    May 7, 2016 6:48 AM in response to ozeegers

    On page 2, you have...

     

    4       539877984      1464886983   441.1 GiB   0700  DOS_FAT_32_Untitled_2

    We chose ( at Re: bootcamp partition renamed untitled after booting in MacOS ) to use

    D MS Data                539879424 1465145343  925265920

    This introduced the gap of 1440 sectors. Can change your GPT to the original one? Do not use 07, but try to use 0B or 0C.

  • by ozeegers,

    ozeegers ozeegers May 8, 2016 1:28 AM in response to Loner T
    Level 1 (5 points)
    Windows Software
    May 8, 2016 1:28 AM in response to Loner T

    did that with 0B but nothing visible in finder....

     

    output:

     

    Disk /dev/rdisk0: 1465149168 sectors, 698.6 GiB

    Logical sector size: 512 bytes

    Disk identifier (GUID): BE924D70-1CD5-4EDB-9B44-947B2100D347

    Partition table holds up to 128 entries

    First usable sector is 34, last usable sector is 1465149134

    Partitions will be aligned on 8-sector boundaries

    Total free space is 262157 sectors (128.0 MiB)

     

    Number  Start (sector)    End (sector)  Size       Code  Name

       1              40          409639   200.0 MiB   EF00  EFI System

       2          409640       538608447   256.6 GiB   AF00  Apple HFS/HFS+

       3       538608448       539877983   619.9 MiB   AB00  Recovery HD

       4       539877984      1464886983   441.1 GiB   AF00  Apple HFS/HFS+

  • by ozeegers,

    ozeegers ozeegers May 8, 2016 1:08 PM in response to ozeegers
    Level 1 (5 points)
    Windows Software
    May 8, 2016 1:08 PM in response to ozeegers

    should we give up?

  • by Loner T,

    Loner T Loner T May 8, 2016 1:47 PM in response to ozeegers
    Level 7 (24,202 points)
    Safari
    May 8, 2016 1:47 PM in response to ozeegers

    ozeegers wrote:

     

       4       539877984      1464886983   441.1 GiB   AF00  Apple HFS/HFS+

    and

    4       539877984      1464886983   441.1 GiB   0700  DOS_FAT_32_Untitled_2

    do not match. Can you update the GPT with 07, 0B and 0C and check each?

  • by ozeegers,

    ozeegers ozeegers May 9, 2016 5:11 AM in response to Loner T
    Level 1 (5 points)
    Windows Software
    May 9, 2016 5:11 AM in response to Loner T

    When I enter 0700 I get partition untitled visible in finder but no files..what do I need to enter for 0B and 0C?

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